On my Ibanez ToneBlaster 50R settings I use are:
Gain: 8
Bass: 11 out of 12
Mid: 10 out of 12
Tremble: 10 out of 12
Volume: 4 because any louder might break some shit.
Reason I have this is because I was messing with amp settings and I got like 6/5/5 with bass/mid/tremble. I read an article about Megadeth and the amp settings so I decided to just multiple them by 2. or well almost by 2 and it sounds ultra nice now.